Zinc-plate cylinder for offset lithographing presses



' S. FLEMING zmc PLATE CYLINDER FOR OFFSET mmoermnme PRESSES Filed Nov.29. 1920 s Sheets-Sheet 1,

INVENTOR.

sl'uar'l' Flemm "a M v. Alrsls.

Oct. 23 1923. 1,471,392

s. FLEMING ZINC PLATE CYLINDER FOR OFFSET LITHOGRAPHING PRESSES FiledNov. 29, 1920 a Sheets-Sheet 2 R an m m, mm A v 7 $1.! MW///////////////A//// 1 c m m a Om 0m W =1 A y u w h. m n HH HHIHHI HIMHHHHMU FHA HH. H. H u WI IH-IPH IN I l h I I I l h l l ldl h "I l I nllnflL l .l b l l l h .l ln l .I l" I l -l S. FLEMING ZINC PLATE CYLINDERFOR OFFSET LITHOGRAPHING PRESSES Filed Nov. 29 1929 3 Sheets-Sheet 5mvam-ron; 5Iuarl' Flemin Patented 0ct.23,1923. i h r 1,471,322

ATE? OF F 9 v i s'rrmnr FLEMING, or OWEN SOUND,- oNTARIdcANADA.

ZINC-PLATE CYLINDER roR OFFSET vVIJII'IHOGRAPHI1\T (5r:31855123911528.

Application filed Hovember as, 1930., Serial 110.427.103.

i T 0 all whom it may concern: der segments suitably secured tothe ends10 Be it known that I; STUART FLEMING, a of the cylinder by the screws'14 threaded".

subject of the King ofGreat- Britain, of'the into longitudinal holes inthe ends of such city of Owen Sound, in the county of Grey, cylindersegments. The segments 13 are e in the Province of Ontario, Canada; havemortised into the ends 10 as shown at 16, 0

invented certain new and useful Improve- (Fig. 2).; 17 is a cylindricalmember joinments in Zinc-Plate Cylinders for Offset ing the bosseslltogether and formed in- Lithographing Presses, of which thefollowtegrally therewith, the cylinder ends 10 be in is thespecification. ing mounted on such bosses 11 and being 1 y inventionrelates to improvements in preferably circular inshape. f zinc platecylinders for offset lithographing The interior of one. end of eachsegment 13 presses and the object of the invention is is bevelled off asis shown at 181 (Fig to devise a cylinder having a plurality of theother end of each segment being subsegments on which are mountedindependent stantially rectangular and the outside corner 1 zinc plates.A further object is to provide rounded off.

means'for readily attaching the zinc plates 19 is an annular webinserted between the to the segments of the cylinder and a furthermember 17 and the cylinder segments 13 object is to construct a cylinderin which and designed to give strength to the centre a plurality ofseparate and distinct lithoof the cylinder segments. 20 are the zinc 20graphing jobs can be run off at the same plates carrying thelithographing matter,'

time instead of having to, do these jobs eachof said plates being hingedatone end separately. A still further object'is to conto a, plate 21 asis shown at 22' (F ig. 4). struct a cylinder which will permit of theThe plate 21 is preferably constructed of ,use of rolls of paper insteadof sheets which light gauge steel and. hasfa longitudinal 25 havehitherto been employed with oflset lithslot 23 therein to permitthelplate to extend l ographing presses, on each side of the'annularweb-19.; 24; My invention consists of a zinc plate are holes inthebottom edge'of the plate 21 cylinder constructed and arrangedsubstanthrough which the cap screfws30 {pass when tially as hereinaftermore particularlydethe plate '21 is'firmly secured between a scribed andillustrated in the accompanying. flattened surface on the shaftf29 andthe drawing in'which: p binding plates 31, by tightening the heads Fig.1 represents a side elevation of a of the cap, screws 30 whichscrew intothe portion of an-oifset lithographing press 'shafti29 againstthebinding' plates 81. I showing my cylinder applied thereto. 25 aresuitably spaced sockets at the. upper 35 Fig. 2 is a side view ofacylinder con edge'of the plate 21 adapted to be inserted structedaccording to my invention showing between suitably spaced opposedsockets 26 the upper portion in elevatio'n andzthe lower formed on thelower edge ofthe zinc plate portion in section. I 20. 27, is a rodextending through the afore Fig. 3 is an end view of one of myc-ylinsaid sockets'for hinging the plates 20 and'21 ders, and ftogether. f. ,95 Fig. 4"is a detail in plan of one of my 28 are ratchet'wheels mo-untedon the zinc plates, showing the -means of attachshafts29 and extending longitudinally ment to the cylinder segments. throughthec yl'inder between themember 17 Like characters ofreference indicatecor and the cylinder segments 13. 30 are cap 1 is the frameof the press..2 is a paper shafts 29. and to carry the binding plates roll. 3 is thepaper adapted to be wound off 31, said shafts 29 being freely mounted inthe roll 2 over the-rollers 4t and 5- and be the ends 10 of thecylinder. I g i tween the feedroller 6 and the printing; 32 arepawls'pivotally connected to the roller 7. 8 is myiz'inc plate-cylinders'uitends 10 and adaptedjto engage 7 the teeth ably mounted in bearings9 inthe frame 1. 5 of theratchet wheels 28 as is shown in Fig.

'10 are the ends of the cylinder provided 3. 33 are squared ends, ontheshafts 29 to with the bosses ll'and shafts 12 by. means which aboxspanner can be japplied for 10f which'the cylinder. is mounted in thethe purpose ofturningisuchshafts. 34: are.

bearings 9 of the "frame 1. 13 are the cylin 'shaftsffreely mounted inthe ends 10 and ex 11 responding parts in the different views: screwsadapted to be threaded into the" 100,

tending longitudinally through the cylinder between the segments 13 and.the member 17,

' nut 41.

On reference to Fig.3 of the drawings it will be seen that the cylindersegments 13 do not abut each other but are spaced apart a certainextent. This permits of the plates 20 and 21 being inserted therebetweenas will hereinafter appear. n

The Zinc plates 20 are applied to the cylinder segments 13 as follows: V

The upper end of the zinc plate 4:2 is bent over into the position shownin Fig.3 and inserted between the tapered end 18 of the cylinder segment13 and the plate on the shaft 34.

By unscrewing the lock nut ll the threaded screw 39 can be tightened upby applying a box-spanner'thereto. As the inner end or the screw 39engages the boss 11 of the member 17, by turning the bolt 39 the arm 36will be forced away from such boss. When this occurs the shaft 34 isturned and with it the plate 35 which is pressed firmly against theturned'over end 42 of the'zinc plate 20. Thus theend ofthe Zinc plate isheld firmly between the plate 35 and the tapered end 18 of the segment13. I l

The upper-"edge of the plate 21, which plate is fastened to the shaft 29as described above, extends through an opening between the cylindersegments 13. The sockets 26 on the lower edge of the plate 20 areinserted between the suitably spaced sockets 25 on the upper edge of theplate 21 as described above, and the rod 27 is inserted through thesockets, thus connecting 20 and 21.

The zinc plate now being firmly attached at both ends-the shaft 29isturned by applying the box-spanner to the'squared end 33 thereof. Thisdraws the plate 21 taut and with it the zinc plate 20 so that such zincplate is drawn down tightly onto the surface of the cylinder segments13. I

All the zinc plates'are applied to the different segments in exactly thesame manner as described aboveandconsequently it will *be seen that suchconstruction will enable any one of the zinc plates to be changedwithout interfering with the other plates.

From the above descriptionit will be seen that I have devised a zincplate cylinder to which different segments can be"applie'dindependently, said segments containing different lithographing matterthus enabling the operator to do a plurality of jobs at the same time. V

. Hitherto 1n ofi'set printing presses the zinc plates only extended fora certain portion of the circumference of the cylinder and the remainingpart of the circumference was wasted. In my devicel make use of aplurality of segments suitably spaced apart giving a printing surface ofthe entire circumference of the'cylinder, except for a small spacebetween each segment which corresponds with and represents the bottomand top margin of the adjacent forms being lithographed.

Hitherto it has been the practice to use the paper stock in sheets ofthe required size, and this is essential where onlyxonc segmental zincplate is used on the cylinder.

in my cylinder however where i use zinc plates for the entirecircumference of the cylinder the paper stock may be used in rolls, thusefi'ecting a considerable economy in paper as well as saving much timein handling the same.

What I claim as my invention is:

1. In a zinc plate cylinder for offset lithographing presses, thecombination with the cylinder, of segmental zinc plates, the one end ofeach zinc plate being turned over inwardly and clamped in the, cylinder,shafts freely mounted in the cylinder, plates hinged to the otherendslof the zinc plates and se cured to said shafts and means forturning the shafts for drawing the zinc plates taut against thecylinder. 7

2. In a zinc plate cylinder for offset lithographing presses, thecombination with the cylinder, of segmental zinc plates, the one endofeach zinc plate being turned over inwardly and clamped in thecylinder, shafts freely mounted in the cylinder, plates hinged to theother ends of the zinc plates and secured to said shafts, said shaftsproiecting beyond the ends of the cylinder, ratchet wheels on said endsof the shafts and pawls engaging the teeth of said ratchet wheels, theends of said shafts being squared.

3. In a zinc plate cylinder for ofiset lith-' ographing presses, thecombination with the cylinder, of segmental zinc plates, the one end ofeach zinc plate being turned over inwardly, longitudinal shaftsfree'lymounted in the cylinder, said shafts carrying outwardly extendingplates, the turned over end of the plate being clamped between theoutwardly extendingplate of the shaft and the cylinder, meansforftightening the outwardly extending plate on the shaft down onto theinwardly turned over end of the zinc plate, shafts freely mounted in thecylinder, plates hinged to the other ends of the zinc plates and securedto said shafts, said shafts projecting. beyond the ends of the cylinder,ratchet wheels on said ends of the shafts and pawlsengaging the teethemma shafts being squared.

graphing presses, the combination with the cylinder, of segmental zincplates, the oneend of each zinc plate being turned over inwardly,longitudinal shafts freelymounted in the cylinder, said shafts carryingoutwardly extending plates, the turned over end of the plate beingclamped between the outwardly extending plate of the shaft and thecylinder, arms suitably secured to the ends of each longitudinallyextending shaft,

a bolt threaded into the free end of each of the arms, a squared outerend on each bolt, a locking nut on each bolt, shafts freely mounted inthe cylinder, plates hinged to the other ends of the zinc plates andsecured to said shafts, said shafts projecting beyond the ends of thecylinder, ratchet wheels on said ends of the shafts and pawls engagingthe teeth of said ratchet wheels,

' the ends of said shafts being squared.

5. In a zinc plate cylinder for offset lithographing presses, a cylindercomprising a central cylindrical member having outwardly extendingbosses formed thereon, cylinder ends keyed to the said bosses, cylindersegments suitably secured to the said cylinder ends and segmental zincplates detachably mounted on the said cylinder segments, one end of eachsegmental zinc plate secured to the corresponding end'of the cylindersegment and the other end adjustably secured to the cylinder,longitudinal shafts freely mounted in the cylinder ends and extendingbetween the inner cylin- I drical member and the cylinder segments,

plates hinged to the zinc plates, bolts on the said shafts, said hingedplates having suitably spaced holes corresponding with the spacing f thebolts on the shafts, said bolts inserted in said holes, securing plateshav- 4:. In a zinc plate cylinder for offset lithodown against thesecuring plates, means for revolving the shafts-andmeans for retain ingthe shafts in any revolved position.

6. In a zinc plate cylinder for otfsetlitho graphing presses, a cylindercomprising a central cylindrical member having outwardly extendingbosses formed thereon,

cylinder ends keyed to the said bosses, cylinder segments suitablysecured to the said cyllinder ends and segmental :zinc plates detachablymounted on the said cylinder segments,

one end of each segmental zinc plate secured to the corresponding end ofthe cylinder segment and the other end adjustably secured to thecylinder, longitudinal shafts freely mounted in the cylinder ends andextending between the inner cylindrical member and the cylindersegments, plates hinged to the zinc plates, bolts on the said shafts,said hinged plates having suitably spaced holes corresponding with thespacing of the bolts on the shafts, said bolts inserted in said holes,securing plates having suit- .able holes, said bolts extending throughsaid holes in the securing plates and nuts threaded on the bolts andscrewed down against the securing plates, means for revolving theshafts, the ends of the shafts projecting out from the cylinder ends,ratchet wheels mounted on the saidcends,

pawls pivotally connected t the cylinder ends engaging the teeth of theratchet wheel the extremity of one end ofeach shaft being squared.

STUART FLEMING.

